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pandas merge validate

If specified, checks if merge is of specified type.

“one_to_one” or “1:1”: check if merge keys are unique in both left and right datasets.

“one_to_many” or “1:m”: check if merge keys are unique in left dataset.

“many_to_one” or “m:1”: check if merge keys are unique in right dataset.

“many_to_many” or “m:m”: allowed, but does not result in checks.

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pandas merge validate

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